Product name:Bike Stand Rocker Feet Adapters Product size about : 1pcs/4pcs Product color: As shown in the figure Product material:PC product features: Made of excellent materialsThe controller plate is equipped with a high-quality wear-resistant balance ball, which is customized for long-term, high-intensity indoor cycling training to provide excellent stability. This design not only strengthens the product to protect the safety of the ride, but also protects the floor from damage  Improve riding comfortThe introduction of bicycle rocker ball feet makes the movement smoother and reduces the burden on the body. With the adapter plate, the 67mm diameter sphere brings 10° all-round horizontal movement, which conforms to the riding movement, reduces the static pressure on the joints, and makes indoor training easier  Activate Core StrengthAdd life-blood to your static trainer riding, upgrade your sports, and double your physical and mental investment. Replace the controller design to strengthen core and balance training, ensuring that every moment of indoor training is challenging and effective  Safe and Efficient New ChoiceChoose our replaceable controller balance ball, upgrade your riding equipment, and enjoy a stable, efficient and safe indoor riding experience. Act now to make exercise more enjoyable  -AFTER-SALES SUPPORT: If you have any questions or concerns about our products, please feel free to contact us. We will be happy to serve you and ensure your satisfaction. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Package Included: 1pcs/4pcs Bike Stand Rocker Feet Adapters Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.